Since publications if the 2nd series fascicle on Tumors of the Peripheral Nervous System, the spectrum of the nerve pathology has markedly expanded. Newly described lesions in this 3rd series fascicle are numerous. Among tumorlike lesions are reactive processes such as inflammatory pseudotumor, hyperplastic lesions including palisaded encapsulate neuroma, and localized hypertrophic neuromuscular choistoma. Benign tumors are cellular schwannoma , a lesion frequently mistaken for malignant peripheral nerve sheath tumor, psammomatous melanotic schwannoma with or without a syndrome association (Carney's complex), intraneural perineurioma, and neurothekeoma. Also described since publications of the 2nd series fascicle are such malignant neoplasma ap purely epithelioid malignant peripheral nerve sheath tumor, glanduar MPNST,MPNSTs derived from schwannoma, and MPNST with perineurial differentiation. The last chapter provides,heavily illustrated presentation of neuroofibromatosis . In order to provide insight the evolution of peripheral nerve lesions, the fascilce begins with a concise, richly illustrated introductory chapter on normal gross and microscopic anatomy of the peripheral nervous system. In typical fascicle format, pathologic features are presented in terms of their gross, histologic, and immunochemical aspects. In addition, the fascicle stresses the utility of electron microscopy in elucidating the nature of lesions and in differential diagnosis. The application of this modality has contributed immensely to our understanding of the normal structure and function of the peripheral nervous system. Practicality, long the hallmark of the Atlas series, is the thrust of this work. Valuable epidemiologic, clinical, and even neruroradiologic correlation is provided, as is clinically correlative data regarding prognostic indicators and syndrome association. This 421-page fascilce includes over 900 illustrations, 841 of which are in color. It should be an essential reference for pathologists in practice and training.